Method and system for rapid initial control signal detection in

Details Method and system for rapid initial control signal detection in Method and system for rapid initial control signal detection in

1997-08-08

1999-06-01

Vo, Don N.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375365, H04L 2706, H04L 700

Patent

active

059094710

ABSTRACT:
A wireless communication subscriber unit comprises a radio frequency downconversion stage that produces in-phase and quadrature phase digital samples. A digital signal processor is connected to receive the samples and process them to produce a control channel correlation output and a carrier frequency offset estimate. The acquisition of the control channel is made substantially immune from initial carrier frequency offsets by differential sample encoding the samples. These are input to a correlator whose coefficients are a pre-stored differential sample encoded, decimated and rate expanded version of the known reference sequence. When the the reference sequence is present, the correlator produces a peak output that can be used to detect the presence of the reference sequence. The time position of the peak can be used for time alignment, for signal quality estimation, and to directly obtain a frequency offset estimate.

REFERENCES:
patent: 5809009 (1998-09-01), Matsuoka et al.

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